Display screen, or portion thereof, with graphical user interface for an optical fiber microscope



FIG. 1 is a front view of a display screen, or portion thereof, with graphical user interface for an optical fiber microscope, showing our new design;

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof; and,

FIG. 4 is a front view of a fourth embodiment thereof.

The oblique line showing and solid black showing in the figures are used as symbols in accordance with MPEP 608.02 IX to illustrate the green color and the black color, respectively. Different forms of stippled surface shadings are used to represent contrasts. The broken lines showing text, graphical elements, and the display screen are included for the purpose of illustrating environmental subject-matter only, and form no part of the claimed design. 

CLAIM The ornamental design for a display screen, or portion thereof, with graphical user interface for an optical fiber microscope, as shown and described. 